Table 4: Univariate analysis of factors associated with satisfactory bowel preparation (Ottawa Scale 0–5).

Satisfactory preparation ()Unsatisfactory preparation () value

Age, y (range)53.8 ± 11 (20–77)56.8 ± 12.1 (25–80)0.057
Gender (male : female)82 (44.1) : 104 (55.9)44 (51.8) : 41 (48.2)0.240
Intervention using SMS108 (58.1)28 (34.6)<0.001
Body mass index, kg/m2 (range)23.5 ± 2.7 (16.0–32.9)23.1 ± 2.5 (18.4–29.4)0.175
History of colonoscopy95 (51.1)41 (48.2)0.664
History of abdominal or pelvic surgery89 (47.8)27 (31.8)0.013
Familial history of colon cancer14 (7.5)3 (3.5)0.208
Indication of colonoscopy0.724
 Screening101 (54.3)42 (49.4)
 Surveillance27 (14.5)13 (15.3)
 Symptoms58 (31.2)30 (35.3)
Chronic comorbid disease
 Diabetes9 (5.9)6 (7.1)0.567
 Thyroid disease6 (3.2)3 (3.5)0.938
Symptoms
 Rectal bleeding9 (4.8)3 (3.5)0.759
 Anemia8 (4.3)1 (1.2)0.281
 Positive stool occult blood1 (0.5)0 (0.0)0.513
 Significant weight loss1 (0.5)1 (1.2)0.530
 Abdominal pain/discomfort/bloating23 (12.4)25 (29.4)0.001
 Change in bowel habits2 (1.1)5 (5.9)0.033
 Diarrhea8 (4.3)2 (2.4)0.729
 Constipation3 (1.6)2 (2.4)0.650
 Polyp detection rate (%)75 (40.3)32 (37.6)0.996
 Adenoma detection rate (%)57 (30.6)27 (31.8)0.587
Compliance with diet instructions165 (88.7)63 (74.1)0.002
≥75% of PEG* ingested186 (100)80 (94.1)0.001
Mean PC interval (h)5:42 ± 2:02 (1:00–9:50)6:47 ± 2:04 (2:30–13:00)<0.001
PC interval 3~5 h59 (31.7)16 (18.8)0.028

Values are mean ± standard deviation or number (% or range).
PEG*, polyethylene glycol; PC interval, preparation-to-colonoscopy interval.